- Backflow Prevention Devices & Services, Sag Harbor
- Bagels, Sag Harbor
- Bakeries, Sag Harbor
- Balloons & Helium, Sag Harbor
- Banking Attorneys & Lawyers, Sag Harbor
- Banks, Sag Harbor
- Baptist Churches, Sag Harbor
- Barber Shops, Sag Harbor
- Barbers, Sag Harbor
- Bars, Sag Harbor
- Bars & Grills, Sag Harbor
- Beauty Salons, Sag Harbor
- Bed & Breakfast, Sag Harbor
- Beer & Ale - Wholesale, Sag Harbor
- Beer & Wine Stores, Sag Harbor
- Beer Taverns, Sag Harbor
- Beverage Stores, Sag Harbor
- Beverages, Sag Harbor
- Bible Church, Sag Harbor
- Bicycle Rentals, Sag Harbor - Bike Rental
- Bicycle Repair & Service, Sag Harbor - Bike Repair Shops
- Boat & Yacht Charter, Sag Harbor
- Boat Services, Sag Harbor
- Boat Storage , Sag Harbor - Equipment & Services
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- Boating & Swimming Clubs, Sag Harbor
- Boats & Yachts, Sag Harbor - Yachts, Sailboats & Boats for Sale
- Boiler Repair & Cleaning, Sag Harbor
- Book Publishers, Sag Harbor - Book Printing & Publishing
- Book Stores, Sag Harbor
- Bookkeeping Systems & Services, Sag Harbor
- Books, Magazines & Newspapers Stores, Sag Harbor - Bookstores
- Boutiques & Boutique Items, Sag Harbor
- Brake Service & Repair, Sag Harbor - Brake Pads
- Builders & Contractors, Sag Harbor
- Builders & Contractors - More, Sag Harbor
- Building & Home Inspection, Sag Harbor - Real Estate, Building, Land & House Inspection Service
- Building Construction Consultants, Sag Harbor - Construction Management & Consulting
- Building Hardware & Materials, Sag Harbor
- Building Materials, Sag Harbor - Wholesale, Manufacturers, Dealers & Suppliers
- Building Materials & Supplies, Sag Harbor
- Bungalows Rental, Sag Harbor
- Burglar Alarm Systems, Sag Harbor
- Bus Lines, Sag Harbor - Bus Transportation
- Bus Lines Ticket Agencies, Sag Harbor
- Business & Professional Associations, Sag Harbor
- Business Legal Services, Sag Harbor
- Business Management Consultants, Sag Harbor
- Business Services, Sag Harbor
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